<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>排序</title>
</head>
<body>
<div>
    <a href="?order=asc">升序</a>
	<a href="?order=desc">降序</a>
	
	<a href="?order=<?=$next_order?>">排序</a>
</div>
</body>
</html>